A method of reducing noise in images formed by uniform regions and textures delimited by edges, comprises a step of filtering these images, a step of detecting edges in these images, a sub-step of re-assigning or no re-assigning each image pixel to an edge or a texture in accordance with the result of a connectivity test, this sub-step taking place at the end of the step of detecting edges and textures and a selection step of eliminating or applying this filtering to each image pixel according to whether this image pixel is associated or not associated with an edge or a texture.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of reducing noise in images formed by uniform regions and textures delimited by edges, the method comprising the steps of: filtering said images, detecting edges and textures in theses images, and a selection step of eliminating or applying said filtering to each image pixel according to whether this image pixel is associated or not associated with an edge or a texture, characterized in that the method comprises, at the end of the step of detecting edges and textures, a sub-step of retaining each edge or texture-detected image pixel as an edge or a texture image pixel in accordance with the result of a connectivity test.
2. A computer program, accessible from a computer-readable medium, which can be executed by means of a processor intended to carry out a noise reduction method as claimed in claim 1 .
3. A video encoding sequence of the MPEG type preceded by a noise reduction method as claimed in claim 1 .
4. A system for processing images formed by uniform regions and textures, delimited by edges, the system comprising, in parallel: a device for filtering said images; a device for detecting edges and textures in said images; and a selection device for eliminating or applying said filtering to each image pixel according to whether this image pixel is associated or not associated with an edge or a texture, characterized in that the system comprises, at the output of said device for detecting edges and textures, a connectivity test device for retaining the assignment of each edge or texture-detected image pixel as an edge or texture image pixel in accordance with a predetermined criterion.
5. A system for processing images as claimed in claim 4 , characterized in that said connectivity test device comprises: a mask filter, a comparator to compare the output of this filter with a predetermined number, and a decision circuit for retaining each edge or texture-detected image pixel as an edge as an edge or texture image pixel when the predetermined number is achieved.
6. A video encoding sequence of the MPEG type preceded by a system for processing images as claimed in claim 4 .
7. The system as recited in claim 4 , wherein the predetermined criterion is a predetermined number.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 27, 2001
January 23, 2007
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